251212066 has 8 divisors (see below), whose sum is σ = 430649280. Its totient is φ = 107662308.

The previous prime is 251212057. The next prime is 251212099. The reversal of 251212066 is 660212152.

251212066 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 251212066.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8971846 + ... + 8971873.

It is an arithmetic number, because the mean of its divisors is an integer number (53831160).

Almost surely, 2^251212066 is an apocalyptic number.

251212066 is a deficient number, since it is larger than the sum of its proper divisors (179437214).

251212066 is a wasteful number, since it uses less digits than its factorization.

251212066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17943728.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 251212066 is about 15849.6708483173. The cubic root of 251212066 is about 630.9769557162.

The spelling of 251212066 in words is "two hundred fifty-one million, two hundred twelve thousand, sixty-six".